2007 Beneteau 343 engine noise - SailNet Community
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post #1 of 13 Old 06-17-2019 Thread Starter
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2007 Beneteau 343 engine noise

I was on a 2007 Beneteau 343 last weekend and noticed a strange behavior.

Sometimes when shifting from reverse to forward the engine starts making a very bad noise. It is banging and really rough. All that has to happen is to adjust the throttle a little and it stops.

This is a Yanmar with a single lever throttle.

Any ideas as to what to look at.

It may be related to switching too fast from reverse to forward.

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post #2 of 13 Old 06-17-2019
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Re: 2007 Beneteau 343 engine noise

Sounds like low rpm's at idle, yanmar and Perkins 3 cylinder engines do it when speed drops below about 800 rpm. Very disconcerting isn't it ?

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post #3 of 13 Old 06-17-2019
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Re: 2007 Beneteau 343 engine noise

Our 3 banger Yanmar has a disconcerting unbalanced shake at 800 rpm....goes away with throttle....was it more than the normal?


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post #4 of 13 Old 06-18-2019
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Re: 2007 Beneteau 343 engine noise

Quote:
Originally Posted by davidpm View Post

It may be related to switching too fast from reverse to forward.
I think my old Yanmar manual says to take a pause between switching gears...?

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post #5 of 13 Old 06-18-2019
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Re: 2007 Beneteau 343 engine noise

Two comments. When cold, my Yanmar 3GM30F will shake if the RPMs are too low. A slight increase in the throttle and she settles down. Not an issue when warm. Second thought is it could be a folding prop not opening properly.

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post #6 of 13 Old 06-18-2019
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Re: 2007 Beneteau 343 engine noise

Hey,

Is this a traditional shaft with strut and cutless bearing? If so I would inspect the strut.

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post #7 of 13 Old 4 Weeks Ago
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Re: 2007 Beneteau 343 engine noise

Are you sure it wasn’t the gear making the noise?


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Re: 2007 Beneteau 343 engine noise

Possibly the damper plate.

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Re: 2007 Beneteau 343 engine noise

My volvo will go clunky for a few secs when a new load kicks in when running at idle... compressor or maybe even the alternator... add some throttle and it quiets down.

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Re: 2007 Beneteau 343 engine noise

Quote:
Originally Posted by boatpoker View Post
Possibly the damper plate.
Had an engine once that would sound clunky on start up, then settle down. Turned out it was pieces/parts of the broken damper plate that were rattling around, until they got stuck somewhere in the rotation.


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